/*
 * ====================================================================
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 *
 *   http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing,
 * software distributed under the License is distributed on an
 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
 * KIND, either express or implied.  See the License for the
 * specific language governing permissions and limitations
 * under the License.
 * ====================================================================
 *
 * This software consists of voluntary contributions made by many
 * individuals on behalf of the Apache Software Foundation.  For more
 * information on the Apache Software Foundation, please see
 * <http://www.apache.org/>.
 *
 */

package org.apache.hc.client5.http.protocol;

import java.net.URI;
import java.util.ArrayList;
import java.util.HashSet;
import java.util.List;
import java.util.Set;

/**
 * This class represents a collection of {@link URI}s used
 * as redirect locations.
 *
 * @since 4.0
 */
public final class RedirectLocations {

    private final Set<URI> unique;
    private final List<URI> all;

    /**
     * Constructs a new instance.
     */
    public RedirectLocations() {
        super();
        this.unique = new HashSet<>();
        this.all = new ArrayList<>();
    }

    /**
     * Test if the URI is present in the collection.
     */
    public boolean contains(final URI uri) {
        return this.unique.contains(uri);
    }

    /**
     * Adds a new URI to the collection.
     */
    public void add(final URI uri) {
        this.unique.add(uri);
        this.all.add(uri);
    }

    /**
     * Returns all redirect {@link URI}s in the order they were added to the collection.
     *
     * @return list of all URIs
     *
     * @since 4.1
     */
    public List<URI> getAll() {
        return new ArrayList<>(this.all);
    }

    /**
     * Returns the URI at the specified position in this list.
     *
     * @param index
     *            index of the location to return
     * @return the URI at the specified position in this list
     * @throws IndexOutOfBoundsException
     *             if the index is out of range (
     *             {@code index &lt; 0 || index &gt;= size()})
     * @since 4.3
     */
    public URI get(final int index) {
        return this.all.get(index);
    }

    /**
     * Returns the number of elements in this list. If this list contains more
     * than {@code Integer.MAX_VALUE} elements, returns
     * {@code Integer.MAX_VALUE}.
     *
     * @return the number of elements in this list
     * @since 4.3
     */
    public int size() {
        return this.all.size();
    }

    public void clear() {
        unique.clear();
        all.clear();
    }

}
